Replicant

I've searched a lot of time for a solution to set my own specified DNS server(s) on Android.
Finally I found DNS man and figured out, that this app is not just for Wi-Fi, it works really great for mobile data, too:

• Just type inside the app your primary and secondary, (or one IP for both) under the 'Global' tagged boxes,
• switch to 'Airplane Mode' (to close all connections)
• switch off 'Airplane Mode' again to reconnect and grant the DNS man app root rights in the upcoming request,
  (that the /etc/resolv.conf could be modified dynamically on every reconnect)
• done.

Over this way you could set your (uncensored/unfiltered) DNS-server(s). If you don't know one, just let you inspire here: https://www.wikileaks.org/wiki/Alternative_DNS/